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UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 39,916 $ 39,442 $ 38,896 $ 37,781 $ 37,741 $ 37,139 $ 37,536 $ 37,393 $ 156,035 $ 149,809 $ 140,278
Total interest expense 1,722 1,637 1,602 1,546 1,557 1,607 1,630 1,597 6,507 6,391 7,169
Net interest income 38,194 37,805 37,294 36,235 36,184 35,532 35,906 35,796 149,528 143,418 133,109
Provision (credit) for loan and lease losses (1,958) (3,647) (7,319) (2,747) (5,371) (1,722) 1,995 (1,316) (15,671) (6,414) (11,310)
Net interest income after provision for loan and lease losses 40,152 $ 41,452 44,613 38,982 41,555 37,254 33,911 37,112 165,199 149,832 144,419
Investment securities gains (losses) 0 (1,866) 0 0 0 240 0 (1,866) 240 482
Income before income taxes 17,417 $ 19,106 20,279 16,154 19,018 13,471 13,027 15,326 72,956 60,842 59,828
Net income $ 10,932 $ 12,206 $ 12,335 $ 10,395 $ 13,265 $ 8,230 $ 9,150 $ 9,808 $ 45,868 $ 40,453 $ 172,075
Basic earnings per share (in dollars per share) $ 0.35 $ 0.39 $ 0.39 $ 0.30 $ 0.37 $ 0.23 $ 0.25 $ 0.23 $ 1.42 $ 1.08 $ 4.10
Diluted earnings per share (in dollars per share) $ 0.34 $ 0.38 $ 0.39 $ 0.29 $ 0.37 $ 0.23 $ 0.25 $ 0.23 $ 1.40 $ 1.07 $ 4.07